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Richard Cullip (RichardCullip) - BPL Premium Member

My Locale San Diego County
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All Forum Posts by Richard Cullip

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Another Stove Efficiency Calculator/Spreadsheet
I enjoy building spreadsheets. In fact, before I retired a couple of years ago, it was part of my job responsibilities. I have created a Stove Efficiency spreadsheet to add to the mix. It has a ...

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 28, 5:58pm

Re: Spreadsheet vs. People
Delmar - I agree. Two of the biggest sources of variation, as I see it, are time to boil and fuel type. Not much discussion, nor reporting of, fuel type as folks are posting efficiency results....

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 27, 7:27pm

Re: Re: Re: Re: Artificial but useful
Glenn - I forgot to mention that those equations expect elevation in feet, relative air pressure in inHg and yield boiling temperature in Fahrenheit. These are the units I'm used to working in.

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 26, 11:07pm

Re: Re: Artificial but useful
Glenn - you convinced me a few pages ago. I've found some ugly, but once coded up, nice equations that use Elevation and Relative Air Pressure to calculate, first Absolute Air Pressure and then...

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 26, 10:45pm

Re: You bet I'm confused
Barometric pressure as reported in weather reports and as measured by barometers are relative pressures not absolute pressures. Local atmospheric pressures are adjusted for elevation to reflect wha...

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 26, 10:10pm

Re: Got it & another question
Galen - Is it possible the prior spreadsheet is showing the fuel used in ml while the new spreadsheet is reporting it in grams? 10.2/13 yields 0.785 which is remarkably close to the density (g/...

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 26, 10:21am

Re: ml
Delmar - you're right. I mis-wrote grams when I should have said ml. I went back and edited my other post to clarify the oops I made. It's hard not to get sloppy with units since there&...

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 25, 10:11pm

Re: Good Catch, Indeed.
Delmar - the .78x is the density of alcohol expressed in g/ml. Set B8 to g/ml if you are entering the fuel amount in ml. (edited to correct my original which errantly said grams)

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 25, 9:23pm

Glenn - we are both right .... LOL
Glenn - We are both right. Density of alcohol is temperature dependent. Density of ethanol is .785 @25C and .789 @20C. Methanol comes in at .7865 @ 25C and .791 @20C

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 25, 5:55pm

Why the Big difference
Okay guys, my head is officially spinning but, no worries, I've wrapped it duct tape to make sure it doesn't explode. I now know way much more then I ever cared to about barometric pressure...

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 25, 5:06pm

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